Considering how many sounds and effects the Pico-8 tracker shares in common with the old NES music format, Is there any enterprising individual out there who might be able to write up a program that could read NSF and output to a file Pico-8 could understand..? I'd love to be able to use some of the classic musics in my carts.

So far I've tried using nsf programs to output to midi, Then from midi to pico-8 but that has had.. Less than desirable results so far.

I can't speak to the conversion, but be careful using ripped sounds in your own carts. There's kind of a fine line between imitating a game with a re/de-make and plain old copyright infringement. At the very least, be careful not to claim any rights if you post something here.